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Does the fact that somebody opposes something mean that, prima facie, that position must be wrong?

No, but given limited time, it makes sense to evaluate whether a source is (edit: heavily) biased or a crackpot before spending attention on them.

There's no such thing as unbiased. The pertinent question is whether they're telling truths or lies.

And a good shorthand for that is whether the is a propaganda site with a history of carefully worded deceptions...

No, but a rejection of Climate Science is good evidence that they do not put the facts first.